How can a different substance (creation) come from Brahman?

[From pure water only pure water can come; not mud.] The actual Nirguna Brahman is beyond imagination. But in the example, your eyes see the pure water and mud [both are imaginable]. Your question is valid with reference to your example. But your example fails in the case of Brahman because Brahman is beyond imagination as said by the Vedas and the Gita. Therefore this question cannot touch the Brahman. Brahman is beyond even the imagination because Brahman is above the four-dimensional space-time model. In this world anything and any incident can be defined by the three-dimensional space and the fourth dimension time. Suppose a car met with an accident on the road at such and such length, at such and such breadth, at such and such height and at such and such time. Length, breadth and height are the three dimensions of the space. Time happens to be the fourth dimension. The intelligence of any human being cannot cross the three dimensions of the space and the fourth dimension time. Can you imagine the situation when this space and time disappear? Even if you think for one hundred years you cannot imagine the situation. Brahman is the cause of the space and therefore is beyond space as said in the Veda (Atmana Akaasah Sambhutah). Space is the effect and Brahman is the cause. When you cannot cross the space, how can you touch the Brahman? Nobody can imagine the situation when the space disappears even if he thinks for millions of years. Therefore Brahman can never be touched even by your imagination. How can you compare such a Brahman with pure water, which is seen by your naked eye? When a simile for the Brahman is not available, how can you speak about the nature and the action of the Brahman? You can only imagine the power (Maya) of the Brahman from this world, since the world is the modification of the Maya. Maya is the simple awareness and is also inexplicable. You can touch the component of awareness of Maya but you cannot touch the other component that is the inexplicability of the Maya. This entire world is explicable to a certain extent and when we go into the deep analysis of the world, the inexplicability is revealed. Scientists have gone into the depth of this world only to a certain extent and have agreed on the inexplicable nature of the world when it is deeply analyzed. Heisenberg gave the uncertainty principle in science, which accepts the inexplicability of nature. If it is very deeply analyzed, it explains the failure of even very sensitive and sophisticated instruments. The source of Maya is Brahman, which has both the components i.e., awareness and inexplicability to infinite extent. We cannot touch the Brahman or the Maya. Due to the existence of this world we can infer the Maya. Since the Maya should have a base or substratum we can again infer the existence of Brahman. The Veda says that only the existence of Brahman can be inferred and nothing more (Astheetyeva Upalabdhavyah). This Brahman with His power, Maya, enters a human body, which is the modification of Maya. The modification of Maya is called as Prakriti. This entire world is Prakriti. The human body which is a part and parcel of the world is also Prakriti. The superficial explicability of Prakriti i.e., the human body is the only way through which you can attain Brahman here itself. Except this there is no other way as said in the Veda (Nanyah Panthaa Ayanaaya). Only through the metallic wire can you approach electric current and experience it. The body of Krishna is Prakriti. The internal form of Krishna called Narayana is that inexplicable Brahman associated with that inexplicable power to lift the mountain on His finger. Only through Krishna can you experience Narayana and His power. If you discard the human incarnation you are lost forever because your human rebirth is very very doubtful as said in the Veda (Iha Chet Avedeet Atha Satyamasti, Nachet Ihavedeet Mahateevinastih).